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%%  Example 01-08-4 
%%  Copyright (C) 2017 Herbert Voss
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% Show page(s) 1
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\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}

%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
\begin{equation}
\frac{1}{2}\Delta(f_{ij}f^{ij})=2\left(\sum_{i<j}\chi_{ij}
    (\sigma_{i}-\sigma_{j})^{2}+f^{ij}\nabla_{j}\nabla_{i}(\Delta f)
    +\nabla_{k}f_{ij}\nabla^{k}f^{ij}+f^{ij}f^{k}[2\nabla_{i}R_{jk}
    -\nabla_{k}R_{ij}]\right)
\end{equation}
\end{document}
